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ThanksULNS means "Ultra Low Nutrient System", as in your nutrient levels are zero to barely detectable. An example of this would be running a Zeovit or Aquaforest Zeo system, where keeping NO3 and PO4 at 0 is "recommended".
ULNS usually have to run lower dKh levels, as low nutrients + high dKh usually (always) leads to tip burns in SPS, and tissue recession. The aim for ULNS is "natural seawater levels" ie a dKh of 6.5-7.5. Often feeding has to be high, but nutrient export has to be just as effective.